Bring a large pot of salted water to a boil; blanch florets for about 5 minutes, then scoop out with a skimmer or strainer and transfer to a bowl of cold water.,Keep the pot of water simmering while you drain the cauliflower and cut it into small pieces.,______,Add capers and cauliflower and simmer until the tomatoes have cooked down a bit, 10 to 15 minutes; taste and adjust seasonings.,Meanwhile, bring the pot of water back to a boil and add the pasta; cook according to package directions, about 7 or 8 minutes.,Transfer cooked pasta to the skillet (with the sauce), along with 1/2 cup of the pasta water; stir to combine.,Stir in the parsley and Parmesan or sprinkle them on top to garnish.